How to stream AVRCP on Slacker Radio App

Does anybody know how to enable or stream Bluetooth metadata to my car stereo from the Slacker Radio app?

I have a ATT Galaxy 4.2.2 and I am able to use the car buttons to pause and go to the next song in the Slacker app, but the song name and artist do not show up on the screen. I tried the modded Spotify app and that successfully streams Bluetooth metadata, but I could not find a mod for the Slacker app.

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